Malicious PDF — malware analysis report

Static analysis result for SHA-256 b574453a62a8a3be…

MALICIOUS

PDF

76.9 KB Created: 2021-09-01 16:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: badcb799c5504f53c603e6ef86e435ea SHA-1: 637ab64a439f8f71e91b1bf83d0a2a47fe7d45e2 SHA-256: b574453a62a8a3bea9d2d637bd9ac06de6285ef1744dcc3570b0de1e5099f7da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=sorry+for+the+late+reply+to+your+email PDF link annotation
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a740a9c58b2---kodav.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/17361604508.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/38470613026.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e4efce69a---65433816400.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/u9cl7de3nrehtttf9ogf2ut4e5/47442692274.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd66aac7a67---26055162385.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/wajivu.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/52730201225.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/telivosabevavetamoluwo.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/79756496974.pdfIn PDF document text
    • https://bonacorsi.it/file/47877544362.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/rurapokoximam.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/42569289332.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b942eace---41828253296.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/078e2ce39d861b36a932fc3d4ca3afc2/gabiretobuzomexor.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/pafugebowosera.pdfIn PDF document text
    • https://vayoto.vn/userfiles/file/4077188004.pdfIn PDF document text
    • http://kleiberit.ru/files/file/zimaretile.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/62089816714.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/35045340441.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/gadufoxokide.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/70810123202.pdfIn PDF document text
    • https://s-h.cc/uploads//files/202108070806171128.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/31960646821.pdfIn PDF document text
    • http://elskenecologie.nl/files/sajizagezozaba.pdfIn PDF document text
    • https://podimercrm.com/img/files/serodinalara.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC882 17072 bytes
SHA-256: b6d92d0fd2c20710fe61348e37f54115ce183b3709a8e50b9d2c37d169015aea
font_01_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 10640 bytes
SHA-256: d563e63393a7095b5fed4be709c0c58a4799597a628a955ca49c1db484b6c6b6
font_02_sfnt_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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